/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.handmark.pulltorefresh.library;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.View.MeasureSpec;
import android.widget.GridView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.AbsListView.LayoutParams;
import android.widget.ListView.FixedViewInfo;

import com.handmark.pulltorefresh.library.internal.EmptyViewMethodAccessor;

public class PullToRefreshGridView extends PullToRefreshAdapterViewBase<HeaderGridView> {
	private FixedViewInfo mHeaderViewInfo;
	private int initialTopPadding=0;
	private int headerViewHeight = 0;
	private Boolean bringToFront=true;
	private int mDisplayWidth = 0;
	private ListAdapter originalAdapter;
	public PullToRefreshGridView(Context context) {
		super(context);
	}

	public PullToRefreshGridView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public PullToRefreshGridView(Context context, Mode mode) {
		super(context, mode);
	}

	public PullToRefreshGridView(Context context, Mode mode, AnimationStyle style) {
		super(context, mode, style);
	}

	@Override
	public final Orientation getPullToRefreshScrollDirection() {
		return Orientation.VERTICAL;
	}
	 public void addHeaderView(View v) {
	    	this.addHeaderView(v, null, false);
	    }
	 public void addHeaderView( final View v, final Object data, final boolean isSelectable) 
		{
	        mHeaderViewInfo = new ListView(getContext()).new FixedViewInfo();
	        mHeaderViewInfo.view = v;
	        mHeaderViewInfo.data = data;
	        mHeaderViewInfo.isSelectable = isSelectable;

	        setupView(v);
	        
	        int topPadding = getPaddingTop();
	        if(initialTopPadding == 0){
	        	initialTopPadding = topPadding;
	        }
	        headerViewHeight = v.getMeasuredHeight();
	        
	        RelativeLayout parent = (RelativeLayout)getParent();
	        parent.addView(v, 0);
	        if ( bringToFront )
	        {
	        	v.bringToFront();
	        }
	    }
	  private void setupView(View v)
	    {
	    	boolean isLayedOut = !((v.getRight()==0) && (v.getLeft()==0) && (v.getTop()==0) && (v.getBottom()==0));
	    	
	    	if(v.getMeasuredHeight() != 0 && isLayedOut ) return;
	    	
	    	if(mDisplayWidth == 0){
	    		DisplayMetrics displaymetrics = new DisplayMetrics();
	        	((Activity) getContext()).getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
	    		mDisplayWidth = displaymetrics.widthPixels;
	    		
	    	}
	    	v.setLayoutParams(new LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
	    	v.measure(MeasureSpec.makeMeasureSpec(mDisplayWidth, MeasureSpec.AT_MOST), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
	    	v.layout(0, getTotalHeaderHeight(), v.getMeasuredWidth(), getTotalHeaderHeight() + v.getMeasuredHeight());
	    }
	  private int getTotalHeaderHeight()
	    {
			return headerViewHeight;
	    }
	  public void removeHeaderView() 
		{
	        if (mHeaderViewInfo != null) 
	        {
	        	RelativeLayout parent = (RelativeLayout)this.getParent();
	            parent.removeView( mHeaderViewInfo.view );
	            super.setAdapter(originalAdapter);
	        }
	    }
	@Override
	protected final HeaderGridView createRefreshableView(Context context, AttributeSet attrs) {
		final HeaderGridView gv;
		if (VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD) {
			gv = new InternalGridViewSDK9(context, attrs);
		} else {
			gv = new InternalGridView(context, attrs);
		}

		// Use Generated ID (from res/values/ids.xml)
		gv.setId(R.id.gridview);
		return gv;
	}

	class InternalGridView extends HeaderGridView implements EmptyViewMethodAccessor {

		public InternalGridView(Context context, AttributeSet attrs) {
			super(context, attrs);
		}

		@Override
		public void setEmptyView(View emptyView) {
			PullToRefreshGridView.this.setEmptyView(emptyView);
		}

		@Override
		public void setEmptyViewInternal(View emptyView) {
			super.setEmptyView(emptyView);
		}
	}

	@TargetApi(9)
	final class InternalGridViewSDK9 extends InternalGridView {

		public InternalGridViewSDK9(Context context, AttributeSet attrs) {
			super(context, attrs);
		}

		@Override
		protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX,
				int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {

			final boolean returnValue = super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX,
					scrollRangeY, maxOverScrollX, maxOverScrollY, isTouchEvent);

			// Does all of the hard work...
			OverscrollHelper.overScrollBy(PullToRefreshGridView.this, deltaX, scrollX, deltaY, scrollY, isTouchEvent);

			return returnValue;
		}
	}
}
